RedSonic Vault Exploit Drains 9.25 ETH in Ethereum Flash Loan Attack

Nevoral

September 5, 2026

RedSonic Vault Exploit Drains 9.25 ETH in Ethereum Flash Loan Attack
RedSonic Vault Exploit Drains 9.25 ETH in Ethereum Flash Loan Attack

September 5, 2026

Nevoral

RedSonic Vault Exploit Drains 9.25 ETH in Ethereum Flash Loan Attack

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TLDR: RedSonic Vault lost 9.25 ETH after an attacker exploited a dual-asset pricing flaw entirely. A permissionless registerErc20 function let the attacker add a second, conflicting stETH share class. The attacker flash-loaned 1,139 WETH from Balancer and needed zero starting capital of their own. ExVulSec traced the full exploit…
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